Hammer Drill vs. Rotary Hammer: Battle of the Heavyweights
When it comes to really tough DIY tasks, a hammer drill and a rotary hammer are your top choices. Which power tool is right for which job, and what do you need to know before using them? This tool showdown has all the answers!
Rotary Hammer Profile
Name: Rotary Hammer
Specialty: Heavy-duty demolition and renovation work on concrete, natural stone, and masonry
Suitable for: Hard masonry, all materials from stone and wood to metal
Functions: Drilling, impact drilling, chiseling, hammer drilling, gouging (with appropriate keyless chuck)
Impact Drill Profile
Name: Impact Drill
Specialty: Precise work for many DIY projects (e.g., mounting shelves)
Suitable for: Soft masonry, natural stone, lightweight concrete, wood, metal, plastic
Functions: Drilling, impact drilling, chiseling, slotting
Similarities & Differences
In terms of their basic functions, the hammer drill and rotary hammer are identical: both drill into various materials and can boost their power with an impact mechanism. You can get both types of devices as a handy cordless tool or as a corded power tool.
An impact drill is equipped with either a 2-speed gearbox or a speed controller. With a 2-speed gearbox, the first gear is ideal for drilling large holes in tougher materials like sand-lime brick. It features a low speed with high torque. The second gear operates with low torque and higher speed. This allows you to drill precise holes in wood or plastic.
A rotary hammer can do more than just drill, it can also chisel: the drill bit has room to move within its SDS chuck and can vibrate axially. There is also a major difference in power transmission between an impact drill and a rotary hammer:
A rotary hammer has an automatic impact mechanism. Its power depends on the motor and its output – meaning the tool itself.
With an impact drill, you regulate the impact force through the pressure applied to the material – meaning muscle power.
If you want to work with very hard materials, a rotary hammer drill will quickly push you to your (physical) limits. On the other hand, a demolition hammer has too much power to safely work on soft materials or drill precise holes.
The most important factor is the combination of impact force, speed, and impact frequency.
Rotary Hammer | Hammer Drill |
|
|---|---|---|
Action | Power transmission | Speed |
Impact rate | low; approx. 4,000 bpm | high; approx. 40,000 bpm |
Impact energy | high; up to 30 Joules | low; usually under 1 Joule |
The rotary hammer gets its power from a high impact force, so it only needs a low impact rate. With a hammer drill, it's the other way around. It works quickly but carefully into more sensitive materials.
Summary: Which tool for which task?
The rotary hammer is ideal for heavy-duty jobs that require a lot of power. When renovating, making a wall breakthrough, or doing masonry work in the garden, it is often indispensable. The hammer drill is the better choice for precision and a delicate touch. It is used much more frequently in everyday life and in the workshop.
Rotary Hammer | Hammer Drill |
|---|---|
Chiseling + breaking hard masonry | Breaking soft masonry |
Materials such as natural stone, concrete, granite, solid brick | Materials such as sand-lime brick, lightweight concrete, metal, wood, plastic |
Drilling large diameters (core drilling) | Drilling small diameters |
Tiling and chiseling |
